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J. R. BROWN. MACHINE FOR CUTTING SCREWS.

Patented Sept. 15

UNITED STATES PATENT OFFICE.

JAMES 'R.- BROWN, OF BOSTON, MASS, ASSIGNOR TO BROWN & ASHCROFT.

MACHINE FOR CUTTING. SCREWS.

Specification forming part of Letters Patent No. 39,988, dated September 15, 1863; antedaied February 29, 1861 To all whom it may concern:

Be it known that I, JAMES R. BROWN, of Boston, in thecounty of Suffolk and State of Massachusetts, have invented a new and use- .ful or Improved Machine for Cutting. Screws upon Either Gylindrical Pipes or Rods; and ldo hereby declare the same to be fully describediu the following specification, and illustrated in the accompanying drawings, of

. which,

Figure 1 denotes a top view, Fig. 2 a longitudinal and horizontal section, and Fig. 3 a longitudinal and vertical section, of my said machine.

In the drawings, A denotes the frame for supporting the operative parts of the machine. One end of said frame has a cylindrical hole formed vertically through it for reception of a hollow circular tool or die-carrier, B, which on its inner surface carries a series of dies or screwcutters, a a a a, the same extending inward, as seen in the drawings. The said carrier has also a ilange, b, projecting from one'end at right angles to its periphery, the said flange being made to rest upon one edge of the collar 0. To the rear face of the cutter or diecarrier a hollow cap or frame, 0, is screwed or otherwise properly affixed, the base of the said cap having a diameter somewhat greater than that of the said carrier and suflicient to extend over the edge of the collarcand serve, in conjunction with the flange, to maintain the collar in its proper path of rotation. The said collar 0, at its opposite end, is provided with a female screw, d which receives a tubular screwguide, D, so made as to fit into the female screw d. Furthermore, the guide or holder .1) is furnished with one or more clamp-screws,

E, which enter it laterally, as shown in Fig. 3, and serve to clamp it on a pipe or collar, 0, which-may encompass such pipe. The tool or die-carrier B has a ratchet, F, extending around through the middle of its periphery, each cavity e of such ratchet being formed with two shoulders or bearing-surfaces, ff, as seen in the drawings. A socket or cavity, G,is formed in a projection, H; extending from the collar 0, the same being for the reception of a lever, 1, such lever being so adapted to the socket as to be capable'of being revolved axially in the socket an arc of one hundred and eighty degrees. The lever is maintained in the socket by a stud or screw, h,which passes transversely through the lower part of the projection '11 and into a slot, i, formed crosswise of the lever I, as shown in the drawings. The leverlreceives a spring bolt or pawl, K,-shaped in longitudinal-section as shown in Fig. 3. This spring bolt or pawl slides freely in the lever, and is forced against the ratchet by a spring, I). That end of the bolt which operates against the ratchet is constructed acute angular, as shown at l in Fig. 3, the same being to enable it to slip over the ratchet F'when turned backward or in one direction. Furthermore, the leverI is prevented from revolving in its socket by means of a th umb-sprin g bolt, m, and a slot, 0, the former of which is disposed within a cavity. 'n, in the end of the projection or part H, while the latter is formed in a collar, 19, arranged in the handle, as seen in Fig.3. By turnin g the collar 0 in one direction on the carrier" A, the spring-bolt will be brought up against one of the shoulders of the ratchet, and will cause the part A to rotate with the collar; but if the movement of the collar be reversed, thebolt, 'owin g to its peculiar construction, (unless it may have been turned axially one hundred and eighty degrees, as hereinbefore described,) will slip over the ratchet-shoulders and effect no rotation of the carrier. To reverse the motion of the earlier we have simply to push back the bolt m out of the notch o in the collar 10. This having been done, we next rotate the lever I one hundred and eighty degrees. By this means we shall have so turned the spring-bolt that it will operate on the opposite shoulders of the ratchet, and consequent] y cause the ratchet-carrier to be moved in the opposite direction, the said spring-bolt slipping over the ratchet while such bolt is moved backward by means of the lover I.

In usingthe said machine the pipe or rod on which it maybe desirable to cut a screw is to be passed through the guide D and have the latter clamped to it concentrically. Should the pipe or rod have a diameter less than the bore of the guide D, a collar of suitable size may be applied to the pipe, so as to surround it closely and fit into the bore of the part D, the end of the pipe being brought against the dies or cutters a a a a. Next, by turning the carrier A by means of the lover I, which may be supposed to have imparted to it a reciproeating motion, the pipe or rod will be advanced toward the dies or cutters, or they Will be carried against the pipe and will form a screw on it in correspondence with that of the guide I). By reversing the movement of the carrier in manner as above described we can return the pipe to its normal position, or that which it had with respect to the cutters before they commenced to act on it.

I claim-- 7 1. A screw-cutting machinehaving its parts constructed and operating to cut a screw upon a pipe or cylinder, substantially as set forth.

2. The combination and arrangement of the screw-guide D, the tubular cutter-carrier B, provided with dies at a a a, and the ratchet and pawl K F, constructed and made to operate as set forth.

3. The peculiar construction of the said ratchet and pawl and their application to the en tter-carrier B and the lever I, the same being substantially in manner and for the purpose as specified.

JAMES R. BROWN Witnesses:

F. A. BROOKS, F; P. HALE, Jr. 

